O'Reiley's Active Directory Cookbook gives an explanation in chapter 6:
6.28.1 Problem:
You want to determine qui users have pas logged on recently.
6.28.2 Solution
6.28.2.1 Using a graphical user interface
Ouvrez le Active Directory Users et Computers snap-in.
In le left pane, faites un clic droit sur le domain et select Find.
Beside Find, select Common Queries.
Sélectionnez le number of days beside Days depuis dernier logon.
Click le Find Now button.
6.28.2.2 Using a command-line interface
dsquery user -inactive < NumWeeks >
To get more information, see recipe 6.28
